Remove x-dl headers for the external sources (#3048)

Author: melikhov-dev

src/server/components/charts-engine/components/processor/data-fetcher.ts

@@ -738,6 +738,9 @@ export class DataFetcher {
         ];
         if (Array.isArray(proxyHeaders)) {
             proxyHeaders.forEach((headerName) => {
+                if (sourceConfig.isExternal && headerName.toLowerCase().startsWith('x-dl')) {
+                    return;
+                }
                 if (subrequestHeaders[headerName]) {
                     headers[headerName] = subrequestHeaders[headerName];
                 }

src/server/components/charts-engine/types.ts

@@ -200,6 +200,7 @@ export type SourceConfig = {
 
     args?: Record<string, string | number | (string | number)[]>;
     maxRedirects?: number;
+    isExternal?: boolean;
 };
 
 export enum MiddlewareStage {